This book is about the degree to which people take pleasure in life: in short 'happiness'. It tries to identify conditions that favor a positive appreciation of life. Thus it hopes to shed more light on a longstanding and intriguing ques tion and, possibly, to guide attempts to improve the human lot. During the preceding decades a growing number of investigations have dealt with this issue. As a result there is now a sizable body of data. Yet it is quite difficult to make sense of it. There is a muddle of theories, concepts and indicators, and many of the findings seem to be contradictory....

This book describes why conventional methods fall short to solve the comparability problem and introduces three successive innovations to overcome these shortcomings.